<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">
         /* 
            porps是用来做父子组件通信的
        - 在父组件中使用子组件的时候,可以给子组件添加属性
        - 在子组件中组件实例的props属性上,就能拿到这个属性和值
    
    */
    class Parent extends React.Component{
      state = { 
        fruit:'橘子'
      }

      父组件
      render(){
        const {fruit} = this.state;
        return (
            <div>
            <button onClick = {this.changeFruit}>修改水果</button>
            <h1>我是父组件</h1>
            <p>今天吃{fruit}</p> 
            <hr/>
            <Child  fruit={fruit}/>   
            </div>
        )
      }
    //   修改父组件的state，子组件也可以拿到数据
      changeFruit = () =>{
        this.setState({fruit:'苹果'})
      }
    }

     class Child extends React.Component{

        render(){
            console.log(this);
            let {fruit} = this.props;
            fruit = '很多的'+ fruit;
            return (
                <p>子组件，今天吃{fruit}</p>
            )
            
        }
     }
        const root = ReactDOM.createRoot(document.getElementById('app'));
        root.render(<Parent />)
  </script>
</body>

</html>